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How does focusing work?

Need some help here. I need some information on how focusing actually work in the various distances. E.g. You have a maximium distance in the focusing scale, after that it jumps to infinity. How does infinity work? Infinity means how far and beyond? (Infinity is a pretty odd word to use with the word focusing.)

Given any lense, there is a significant, or a certain focusing threshold. Once beyond that threshold, the improvement in sharpness is little or insignificant. And the adjustment required to achieve that becomes too minute for the motor to accomplished.